The CGM Blog
A Guide to Managing Blood Sugar During Exercise
Exercise is one of the most important things anyone can do for their body and health. Exercise can help you maintain a healthy weight, strengthen your bones and muscles, help you sleep better, and can improve your mood among many other great benefits.1
There are also many benefits of exercise for people living with diabetes. When you are active, your body uses more energy (calories) which can help control blood sugar levels more easily. Exercise also helps your body use insulin more efficiently1 and plays an important role in your diabetes management over time.
In all cases, the best type of exercise for anyone is what you will do! There is no “right” way to exercise—you should find what works best for you. Always discuss any exercise plan with your healthcare provider team to find what might be best for you and your overall health. Some people like to work out at the gym or go for walks. Others prefer to play sports, such as basketball or soccer. Hiking, playing frisbee, and dancing are also great ways to be active that also can be fun. You can even do exercises at home, like stretching or yoga, to get your daily movement in.
No matter what type of exercise you choose, it’s a good idea to start slowly and make it a habit over time. This will help prevent injuries and ensure you have a good experience as you get started. If you’re thinking of trying a new exercise program, be sure to check with your healthcare professional before beginning. Don’t forget, even starting with 10 to 15 minutes per day of exercise can add up and help you manage your diabetes.
Benefits Of Exercise For People Living With Diabetes
Studies have shown that moderate to high levels of physical activity are associated with improved health. This is true for people living with and without diabetes.2
For people living with diabetes, the benefits of exercise are even greater.2 Exercise helps balance blood sugar and improve glycemic control; it reduces the risk of heart disease and stroke, and can help with weight loss or weight management.2 According to the Diabetes Canada treatment guidelines, 150 minutes per week of moderate to high level of activity spread out over at least 3 days is recommended, though smaller amounts still provide some health benefits.2 There are many ways to get aerobic or cardio physical activity, including walking, running, biking, swimming, or even raking leaves. It’s important to find something you enjoy so that you will be more likely to stick with it. Resistance activities, such as weightlifting, are also beneficial to diabetes management. Resistance training improves glycemic control, decreases insulin resistance, and increases muscular strength in adults with type 2 diabetes.3
Before you engage in any high-intensity exercise, don't forget to discuss it with your doctor or healthcare professional. If you are new to exercise or have been inactive for a long time, it’s a good idea to start slowly and gradually increase your activity level with guidance from your healthcare professional.
Monitoring Your Glucose During Exercise
People often wonder if exercise lowers blood sugar. Exercise has the power to lower blood sugar levels in the moment and A1C in the long run if done regularly.4 Prolonged aerobic exercise can increase insulin sensitivity for up to 48 hours and may require adjustments to insulin and carbohydrate intake to prevent hypoglycemia. On the other hand, glucose levels can rise with brief intense exercise.2 The effect of physical activity may be different from person to person, which is why it is important to monitor your blood sugar levels regularly. The American Diabetes Association (ADA) recommends that you check your blood sugar levels before and after exercise.4 This is especially critical if you’re not sure how your body will react to a particular type or intensity of exercise.
Monitoring your blood glucose during exercise can also help you understand the benefits of different activities. You can use your blood sugar results to see how your body responds to each exercise, adjust your diabetes medications as needed, and make any necessary dietary changes.
Continuous glucose monitoring (CGM) with devices such as the Dexcom G6 CGM System can help you monitor your glucose levels in real-time while you’re active. You can simply glance at your compatible smart device* or receiver to see if you’re trending high or low while waiting for your turn to bat or during a pause in your dance class. This real-time and on-demand information can help you adjust your diabetes management plan as needed and make more informed treatment decisions.
Be Unstoppable
Living with diabetes doesn't mean you have to limit your activities. There are many athletes with diabetes out there who are living life to the fullest and setting an example for others. Athletes and Dexcom Warriors like Max Domi and Sébastien Sasseville prove that anything is possible.
- Max Domi is a professional hockey player with type 1 diabetes and a great example of how you can be successful while managing diabetes. He wears a Dexcom CGM device during games to help him monitor his glucose levels and make any necessary adjustments to his diabetes management plan.
- Sébastien Sasseville is an inspiring cyclist who has found success as an endurance athlete living with diabetes. In 2021, he cycled across Canada in just 15 days in support of JDRF's Access For All campaign.
Of course, you don't have to be an elite athlete to feel unstoppable. Making small, positive choices for your health and well-being over time can add up to big changes and results. The next time you feel like diabetes is holding you back, remember that diabetes is only one part of who you are. The rest of you is strong, resilient, and capable of anything you set your mind to. With the right diabetes management strategies in place, nothing is stopping you from reaching your goals.
* Click here for a list of compatible devices.
1 Exercise & activity. (2022). Retrieved 21 January 2022, from https://www.diabetes.ca/nutrition---fitness/exercise---activity
2 Sigal R, et al. Physical Activity and Diabetes. Canadian Journal Of Diabetes. 2018;42(Supp 1):S54-S63.
3 Gordon, B., Benson, A., Bird, S., & Fraser, S. (2009). Resistance training improves metabolic health in type 2 diabetes: A systematic review. Diabetes Research And Clinical Practice, 83(2), 157-175. doi: 10.1016/j.diabres.2008.11.024
4 Blood Sugar and Exercise | ADA. (2022). Retrieved 21 January 2022, from https://www.diabetes.org/healthy-living/fitness/getting-started-safely/blood-glucose-and-exercise
2 Sigal R, et al. Physical Activity and Diabetes. Canadian Journal Of Diabetes. 2018;42(Supp 1):S54-S63.
3 Gordon, B., Benson, A., Bird, S., & Fraser, S. (2009). Resistance training improves metabolic health in type 2 diabetes: A systematic review. Diabetes Research And Clinical Practice, 83(2), 157-175. doi: 10.1016/j.diabres.2008.11.024
4 Blood Sugar and Exercise | ADA. (2022). Retrieved 21 January 2022, from https://www.diabetes.org/healthy-living/fitness/getting-started-safely/blood-glucose-and-exercise